3(i-4)=21

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Solution for 3(i-4)=21 equation: 


Simplifying
3(i + -4) = 21

Reorder the terms:
3(-4 + i) = 21
(-4 * 3 + i * 3) = 21
(-12 + 3i) = 21

Solving
-12 + 3i = 21

Solving for variable 'i'.

Move all terms containing i to the left, all other terms to the right.

Add '12' to each side of the equation.
-12 + 12 + 3i = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 3i = 21 + 12
3i = 21 + 12

Combine like terms: 21 + 12 = 33
3i = 33

Divide each side by '3'.
i = 11

Simplifying
i = 11

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